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Record of Decision System (RODS)



Address:  INT RTE 202 & RTE 30 
City & State:  EXTON  PA  19341
County:  CHESTER
EPA ID:  PAD004351003
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-95/202
ROD Date:  09/29/1995
Operable Unit(s):  01
Media:  Groundwater, Soil
Contaminant:  Volatile organic compounds, trichloroethene (TCE), tetrachloroethen (PCE), 1,1,1-trichloroethane
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

The AIW Frank/Mid-County Mustang Site is located approximately one mile east of Exton on Route 30 in West Whiteland Township, Chester County, Pennsylvania. The site consists of two adjoining properties in addition to the areal extent of contamination which includes the groundwater plume. The combined area of the two adjoining properties is 16 acres. The 16-acre site is bounded to the north-northwest by a Conrail rail line; to the south by Route 30; by open fields to the northwest, northeast and east-northeast; by Meridian Bank to the west-southwest; and by the Flotran/Industrial Hose property to the east-southeast.

The groundwater table in the site area generally reflects surface topographic slopes. Site-specific data suggests that groundwater flows from local topographic highs in the former site production areas toward valley streams. Drinking water for the area within two and two-tenths miles of the site is supplied by private residential wells, commercial wells and three water companies. The Philadelphia Suburban Water Company operates two public water supply wells directly down gradient from the site and within several hundred feet of the leading edge of the contaminant plume. A number of local residences and businesses within the contaminant plume area have private wells that are currently or have been used in the past for drinking water supply and other uses.

The estimated population residing within one mile of the site is 916, which includes about 175 boarding school students. Approximately 4,680 people reside between one and two miles of the site.

The AIW Frank portion of the site property totals over 15 acres and was used in the past for the manufacture of styrofoam products and commercial refrigeration units. The former production areas at the AIW Frank facility are located in the southern half of the property near Route 30. There were, prior to 1991, two abandoned buildings, two parking areas, associated roadways and loading docks on this property. Immediately north of the parking area adjacent to Route 30 was a one story building which was used for manufacturing. This building was destroyed by a fire of unknown origin in 1991. A second building was used for both warehousing and manufacturing. The rear building was gutted after manufacturing was discontinued and currently contains miscellaneous debris along with a number of water/gas lines formerly used for fire protection and manufacturing. The rear building roof partially collapsed during the winter of 1994/1995. Attached to the rear building was a small annex containing numerous decomposed concrete blocks. The annex was dismantled during demolition of the front building.

East of the rear building is the back parking lot area. In the southern portion of this parking area is the location of a former above ground waste solvent tank. A driveway and a paved area containing five to ten above ground tank pedestals lie in the space between the rear building and front building foundation. Nearby are several large pipes accessing three 20,000 gallon underground storage tanks outside the boiler room of the former front building. Liquid can be seen in the tank standpipes. The tanks are believed to have been used for fuel oil storage in the past. A concrete lined drainage ditch crosses through this area, heading into a concrete culvert near the back parking lot. The drainage ditch was used to discharge boiler water to West Valley Creek during the AIW Frank manufacturing period at the site.

The northern half of the facility is an open area overgrown with weeds, brush and small trees. West Valley Creek flows east to west, through the northernmost portion of the property, just south of the Conrail rail line. Downstream, West Valley Creek is a cold water fishery with protected trout fishing. The creek has been impounded on the site property to form a pond. A 300,000 gallon water tower, used in the past as a fire protection water supply for the facility is also located in the overgrown area north of the rear building.
The Mid-County Mustang portion of the site is less than one acre in size and consists of an auto garage, a parking lot, and a small lawn area.

The Mid-County Mustang portion of the site is bordered by the AIW Frank property and a private residence to the east; the former Pipe Maintenance Service (PMS) building to the north; a private residence to the west; and a small open field, Meridian Bank, and Route 30 to the south. The area of concern on the Mid-County Mustang portion of the site is a former tile field, located in the lawn area near the garage. Historical information indicates that previous operators of the auto garage had steamed and utilized solvents to clean auto engines. The liquid waste from the engine cleaning operation was then disposed of in floor drains in the garage building. From the floor drains, the liquid waste was discharged in to the on-site tile field which consisted of a stone filter bed.

The selected remedy described below is the only planned action for the Site. This remedy addresses excavation and disposal of contaminated soils and waste, groundwater remediation and an alternate water supply. Groundwater contamination represents a primary threat; therefore, the extraction and treatment of groundwater and an alternative water supply will be required. Soils and waste on site represent a low-level threat that may through future site use adversely affect human health and groundwater quality. An excavation and off site disposal will be required.
Remedy:  The selected remedy includes the following major components: provision of Point of Use Carbon Filtration Units (until waterline is extended); installation of a water line; performance of a Phase I archeological survey prior to any intrusive remedial activities; excavation and off-site disposal of contaminated soils following predesign soil investigations; removal, decontamination and off-site disposal of drums and sump; structure demolition/restoration; institutional controls; performance of an additional ecological assessment; extraction and treatment via air stripping of groundwater with vapor phase carbon adsorption and subsequent discharge; and long term groundwater monitoring.
Text:  View full-text ROD [ 211K ]
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